Which version of InDesign and OS?
Have you tried trashing your InDesign Preferences?
1 person found this helpful
on master B you should divide the graphic in 2 (one per each page).
also the two graphics should not touch the inside edge of the pages
It is CC (April 2017), Windows 10 x64
It applies Master A and B both on Page number 4.
What were you hoping to do, apply just A to 4-5, or just B, or do you want A on 4 and B on 5?
If you want to assign just A or B, double click the – between the page range 4–5 in the Pages panel, and then hold Alt/Opt and click on A–Master or B–Master.
If you want one of each, you will need to redesign the spreads, as per premio_oscar. The image can't span both pages in that situation.